MCQ On Biomolecule Class-12 » Chemistry-Papers

Find out the correct option among the following statements.

Maltose and lactose are non-reducing sugar

In reducing sugars, aldehydic and ketone group are free bonded

Fehling’s solution and Tollen’s reagent are non-reducing sugar

All monosaccharides whether aldoses or ketoses are reducing sugar

Identify the pair of epimers

D-glucose and D-fructose

D-glucose and D-mannose

D-glucose and L-glucose

D-glucose and D-mannose

Millon’s test is given by

ester

Proteins

Sucrose

Carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone.

Polysaccharide

Monosaccharide

Oligosaccharide

Biuret test is used for

Fats

Sugar

Proteins

Deficiency of biotin causes dermatitis and paralysis, biotin is also known as

vitamin H

vitamin D

vitamin B12

Fructose reduce Tollen’s reagent due to

enolisation of fructose followed by conversion of aldehyde by base

secondary alcoholic group

primary alcoholic group

Proteins are the polymers of -amino acids and they are connected to each other by ------

coordinate bond

peptide bond

ionic bond

D-Glucose and L-Glucose are

diastereomers

enantiomers

epimers

anomers

Fehling’s solution test is given by

fructose

all of these

lactose

glucose

How many number of water molecules are removed from the n number of amino acids during the formation of peptide bond?

(n – 1)

(n – 2)

(n – 3)

Vitamin A is present in-

all of these

butter

fish liver oil

milk

Vitamin C must be supplied regularly in diet because

it is fat soluble hence stored in the body and cannot be used on regular basis

it is water soluble hence used by the body on daily basis and is to be supplied regularly

it is water soluble hence excreted in urine and can’t be stored in the body

How many amino acids (approximately) are involved during the synthesis of protein?

Select the base which is not common in DNA and RNA.

Adenine (A)

Uracil (U)

Cytosine (C)

Guanine (B)

Which of the following vitamins is water soluble?

Vitamin E

Riboflavin

Vitamin D

Which of the following bases is not present in RNA?

Adenine

Thymine

Cytosine

Carbohydrates have

–CHO group

–OH group

> C = O group

All

Which one of the following is reducing sugar?

Cellulose

Glycogen

Starch

Fructose

Phosphodiester linkage is present between which carbon atoms of pentose sugars of nucleotides?

5’ and 5’

3’ and 3’

5’ and 3’

1’ and 5’

Osazone formation involves only 2 carbon atoms of glucose because of

reduction

oxidation

hydrolysis

chelation

Guanine is an example of

a nucleoside

a nucleotide

a nitrogenous base

Which is a fat soluble vitamin?

Vitamin B6

Vitamin C

Vitamin A

The pair of compounds in which both the compounds give positive test with Tollen’s reagent is

glucose and fructose

glucose and sucrose

fructose and sucrose

Which one of the following is non-reducing sugar?

Glucose

Sucrose

Fructose

Maltose

Glucose cannot be classified as ?

Carbohydrate

Oligosaccharide

Hexose

Aldose

Which of the following is the correct statement?

Starch is a polymer of α-glucose

Proteins are composed of only one type of amino acid

Amylose is not a component of starch

Deficiency of vitamin E causes

Muscular weakness

Scurvy

Sterility Anaemia

Molisch’s test reagent is

1% of β-Napthol in alcohol

both

5% solution of α-Napthol in alcohol and few droplets of conc. H2SO4

Which of the following statements is not correct?

Natural proteins are commonly made up of L-isomer of amino acids (D) In -amino acids, - NH2 and

Except glycine, all other amino acids show optical activity

In alpha-amino acids, - NH2 and – COOH groups are attached to different carbon atoms.

The two monosaccharide units obtained on hydrolysis of disaccharide may be

same

different

both

Reduction of hexose A (molecular formula C6H12O6) with sodium borohydride gives compound B and C. Compound B is optically inactive, whereas compound C is optically active . Which of the following is compound A?

D-glucose

D-galactose

D-fructose

D-mannose

Which carbohydrate is used in silvering of mirror?

(A) Sucrose

(B) Fructose

(D) B and C

What will be the sequence of complimentary strand of DNA if the one strand of DNA has the sequence of TATGACTG?

ATACACTC

ATACTGCA

ATACTGAC

In iodine test of starch which colour of ppt had been observed

black

red

blue